Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web.Mobile/UI/MobileControls/DataSourceHelper.cs

@@ -0,0 +1,104 @@
+//------------------------------------------------------------------------------
+// <copyright file="DataSourceHelper.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+using System;
+using System.Collections;
+using System.ComponentModel;
+using System.ComponentModel.Design;
+using System.Data;
+using System.Diagnostics;
+
+namespace System.Web.UI.MobileControls 
+{
+
+    /*
+     * Data Source Helper class. Copied fairly verbatim from ASP.NET code base, and modified
+     * to match our coding standards and, more importantly, use our exceptions.
+     * The ASP.NET file is /system/web/ui/DataSourceHelper.cs (a private class)
+     *
+     * Copyright (c) 2000 Microsoft Corporation
+     */
+
+    [Obsolete("The System.Web.Mobile.dll assembly has been deprecated and should no longer be used. For information about how to develop ASP.NET mobile applications, see http://go.microsoft.com/fwlink/?LinkId=157231.")]
+    internal sealed class DataSourceHelper 
+    {
+
+        private DataSourceHelper() 
+        {
+        }
+
+        internal static IEnumerable GetResolvedDataSource(Object dataSource, String dataMember) 
+        {
+            if (dataSource == null)
+            {
+                return null;
+            }
+
+            IListSource listSource = dataSource as IListSource;
+            if (listSource != null)
+            {
+                IList memberList = listSource.GetList();
+
+                if (listSource.ContainsListCollection == false) 
+                {
+                    // The returned list is itself the list we need to bind to.
+                    // (Ignore DataMember parameter.)
+                    return (IEnumerable)memberList;
+                }
+
+                if ((memberList != null) && (memberList is ITypedList)) 
+                {
+                    ITypedList typedMemberList = (ITypedList)memberList;
+
+                    PropertyDescriptorCollection propDescs = 
+                        typedMemberList.GetItemProperties (new PropertyDescriptor[0]);
+                    if ((propDescs != null) && (propDescs.Count != 0)) 
+                    {
+                        PropertyDescriptor listProperty = null;
+
+                        if ((dataMember == null) || (dataMember.Length == 0)) 
+                        {
+                            listProperty = propDescs[0];
+                        }
+                        else 
+                        {
+                            listProperty = propDescs.Find(dataMember, true);
+                        }
+
+                        if (listProperty != null) 
+                        {
+                            Object listRow = memberList[0];
+                            Object list = listProperty.GetValue(listRow);
+
+                            if ((list != null) && (list is IEnumerable)) 
+                            {
+                                return (IEnumerable)list;
+                            }
+                        }
+
+                        throw new ArgumentException(
+                            SR.GetString(SR.DataSourceHelper_MissingDataMember,
+                                         dataMember));
+                    }
+                    else 
+                    {
+                        throw new ArgumentException(
+                            SR.GetString(SR.DataSourceHelper_DataSourceWithoutDataMember,
+                                         "List DataSource"));
+                    }
+                }
+            }
+
+            if (dataSource is IEnumerable) 
+            {
+                return (IEnumerable)dataSource;
+            }
+
+            return null;
+        }
+    }
+}
+